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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85e81984d3eb67aeae378bd2192c831f6ed9a705f794c148397d0199f16d69ec' 
  AND token = 'q/PiXnci+pDPhJ1Xb9OtvqaNaQHeh24e/8lDLArnkp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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