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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62481f11b4186d578282c350b0fe46152a725887339d683ccd133236f5d579c0' 
  AND token = '6h8KL6yVmkmcZr//L1NZd98jwX6DbBymC7SvZj020vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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