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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0652df6b4e01eded3ac60d26e26b70253b98c23ebf127d00f4eba9229f380de' 
  AND token = 'VJeRqNMIDpTLSQawIAYnDGqmKGq6/Ne0XbIzZ3QK9UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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