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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb1405b6796a26b5b2af130cd1346e7571d63bfdc3dafbd455c6b58df9eb1d30' 
  AND token = 'XDE/AxQ+crfasz/X9TKw3Tv4+OCU4/IZi+l8yBDC1lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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