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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9805009a68d74bc87d6cfac57f082e6bc8f1e9106515c43027d7f855ac9c8873' 
  AND token = 'C60RamIKNAWqVjnXgzSPNVKXblkxEPIzNFXinExhISQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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