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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5213b12d56042243a31588c05838eaad0b2524fd01d267efbf72ed58229c0829' 
  AND token = 'rpMK83hDsS6Kks/7E6NnM7a/uR6KS9nn9L/AKh24SFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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