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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4547bcf75112c3f2741a6266859260acb643765f93b3b62d64cc77a2a98157a' 
  AND token = 'mckFU9mm1m5vmXf+m5zUJxjiy9nO5d9tO6hLg1qQ++w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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