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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62a8d5385e5b4eae731157889922efb013962352db87b5ad7ef69a6daab519e5' 
  AND token = 'hORPyOKEpzTBRQUfMP9qd5i9rhrx/o8LESieoMdnGfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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