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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cebf684590e3ed67dd6af0e02661bead0e8b87163558f360d0de52d9b1d299df' 
  AND token = 'MlrhdckEEwsBMldUzTpytXXyBwAFkf58dS3gPOvVYAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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