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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1530b00635219ec91110cff94f2eed72a9e424ba70fcb32ad7a22a41ea50d08c' 
  AND token = 'WivNMrM/qC+zj0HjzA3kwS1e0WUvOPjsGKNXRPjIx2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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