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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b43f89e704899af4a01af9e19413af2f3d962b4ccdcc63ec94d2d8ec6a6f77b6' 
  AND token = 'BHeRb0GJ/VfAPHtk21A1IZS7pJsK1nzipsLYLLmYg+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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