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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e88eb865d2483e9f3e5213218736daf19e6a427dbb5bd8cf0c8300bda6c6cd04' 
  AND token = 'ACzubJxJ3TkNbZVYh7ZPClepMHZPtlKtmmA7/fhijSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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