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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9beaf95ffb6a706c6ca5cf0510a87d1d2d3fd8c89fa63386833ac6e3c9a2ac19' 
  AND token = 'i3V/X4GTjP/ohRqllpl1h1rjvWeqPWB3k7w7/Ic2ILs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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