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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d8e8c793125c8564ccdaa2b52c157f818fbc2c4f12a42625e905cd5dc502a3' 
  AND token = 'DBUYTHtURUtGBTWFmicYUGxC2kyqphwoTbnTBHCXS8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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