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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1931554b78f027307fd151cef99d186b0f3488c7db44d5aa31b5e56f6fcc637d' 
  AND token = 'HCTDWYjATibsrlTilIpdrGe5qx2LF8Z7g6Fqdaqr9hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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