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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7aae73cb136c25c03aaecec5221176570c7c727c26b55db15267cdd80c36d20' 
  AND token = 'CNQuFimdLWJhrUvAOvg6geOps6jrbJ8sO+ZFc7REDCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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