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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '015d9c84a458a0e5848bfc4481bc66af67845677f23022754c74c4500dcddcd1' 
  AND token = 'EAYFXu5m9o7QyzNEH+HH7Gy4ZP+voy7ip6Zcy535Og8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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