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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc8f0a13b41be58fcc3e2f02cde6039422d5f902b5b2f7c9ac4ca4245cb7edf7' 
  AND token = 'aiPTdTp8jbA39RI+GKgk4ky7AKPdU+XzC6EeaA2G+Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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