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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1039bc27700200ab3a662c2dbff1c2d72b5326f7a7f79a29d3f4379ea5c40a8c' 
  AND token = 'hegtvc3trkqwqsqv2hk6C4ImdTOtcvYgi4GnJPhng+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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