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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c75a08890ece264035ff026f82995c78f91e508714f2d386ca0e6041059d0b2e' 
  AND token = 'pEk90SN+UZhsjJKynxAZfCaZEaBcrL55GyUFSKqeBjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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