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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdda25a2c1915d16117cd22fbfd23a26c8e8554c896f4351fd5d48c1da13d67d' 
  AND token = 'xSK34BIYND7Q21j/L2/gidr281oNBlOPP8Vdd4U9VbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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