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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3f70f3d733703df4e84f76393f9d08030791d67a825b52d93035c9786566319' 
  AND token = 'eK+LukBDJfKvPZv57h4txMm8MLMjF38ma4ApWvS1/Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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