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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b918f2d81425bb9a274c7859fff6387a901b6b8a0dac0c3ad6300eedbbfce52' 
  AND token = '16ClIXfzIE78vV7CUKnEvCWVV/1YtsSwCvF1U7fiWV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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