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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c88e0e2e0ee3f9c199384bbd1526f7688436041bc88c4cb7e82247646205d932' 
  AND token = 'bDWDFmXB6gJHYNHGbcIO7P4/azmPAnA9CJZ1mURIo/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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