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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a02b7e50913cd85aa78cd92d9893f695fad368216c365b26ad3a01418ec6a755' 
  AND token = 'DDMoh3mHXz7GCdkq9ZlpCQB60o+GGaJFeJNrZJ1ScZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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