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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7079de8cf46649aac1f4e933429cb523072829e54d64b6e7cfa85b018a89719d' 
  AND token = 'U8wncSn9z9xd9NLjvy8/XOwc7aJ3WL5qDQhJ8mQ6bF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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