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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ddd4b544771a0e3355007b1b597d93110bb91a7dd3b91397b6d3ac7a4593240' 
  AND token = 'Tl1IDxVvP3JPp3esZJwGel/B0iv0AA6D7iJPHGsAmls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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