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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9310558f2a26f8a7a69596223e61b728215321bfa2817ced69bf88c324c0f50c' 
  AND token = 'jodLOBzy1LF0gNu1hdrsCYem7Jjcyu8iPGM3s9udU4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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