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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0957446e977b0bb779dfe19adb44a4f1ec05964ed3871e7b5b31b119e6d8bb83' 
  AND token = 'xveQUG31Vvo2EPthHzxFlUMLBaX+Ix2xo2n06fDQG4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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