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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebef5e370f45df329563214dedc0f7e4d46a4620eaef8a42b196b5b90433d69d' 
  AND token = 'PrkbD6d7ZINc12mZfPUQVFox/1/HTA3HDP3i2bLR/3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}