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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcc958f9b0818a3086167389f09fab4b9f7ea915958564735cdeefc1750015c3' 
  AND token = 'cT4EGFQzq6k+FzGSKZPo2ks3mrMezfeuyqpZP/MXC4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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