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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06ed9d48a93eacd4c03dd87503228b23ff3e06a2765c55ee54ccdb6a56827d65' 
  AND token = 'c/WovQYarX2uz8BC05M7rTg1HL9Xcwx2uk8GlcKEdZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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