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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8e4985c19a4ca5c64b3c8c715c5b35de50b994a3fd248d82077b3304eff97ce' 
  AND token = 'INx8DjjIU0arQLa9UgwE4iSwPTvEOXTQl7qEi+Xyh0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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