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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '748b3a3c98c5bc61ce51df08723bb714794ece5d518f72b8d169c2462feafa2e' 
  AND token = 'L18jH+8gilmdWi7ghPU37BQHJgP8CMPPB62apynU2ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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