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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '736e357f0603f9e4a59ca6ee862ff41ca92d9aeaddeaf4b9348f4962d18abea2' 
  AND token = '56FFf37MsK6NePo8XSglhBGK9McYbJLmpQGqUldLv04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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