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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc490dc50478e95d94e940dba4335fc0bfb803c1bd0bea4f04c5a967985eb512' 
  AND token = 'LwKbSDfphPvfec0YOt/d3DAHn2VFaghfM6VdDLIn1us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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