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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '948cd679c95a13e67f8a5bc998df3894b08c463e8af89041ff39fe708039d367' 
  AND token = 'MxfOoxUKabqDCTFd+z+VKVrUfOSkYlYyqSNLdlCMdrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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