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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d18f1191c941da9bf180350fd2d566afdd8bfade5a3101e978390afd9d34cb3' 
  AND token = 'oZC15NgecJK6PS6tGyJEvvlGGpLZSEECFoiqDaiK/Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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