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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92359bcd7b6a0ab57a316b010edfe13d65ed1aadf9c726151b262fb6e40cc78' 
  AND token = '25ZeMjM18Uz6oCGIMUT9ONiROPH5u4fd8MPjg3si6rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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