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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0666c994cae6ec0a844500b8e8e8ec74be957ccab07fa84c41464e6ac9a4d141' 
  AND token = 'oj3e5hxLoqpuHLdbud3PPj5ezKWgQuZdj5CpaWHt1Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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