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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '951fac8f104b3e42c96a1674b5ecf1bfe8e87ed5997ef5151da15072ab072ecb' 
  AND token = 'pH793HMuyFT3BG7Iqy7453b38uegulxTWuZLY7CFCbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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