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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b70d7904ea0849b2ead235b13c08606172a368ad0f8eddd586d04b5161416ec8' 
  AND token = 'xO6PJ5x2nAJFHiapz0gdYWJv3b0ZR5rToG5B199te78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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