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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b558fd49f9c80e11a8c01cf63dc69ed1ba0efe05f78d20c9bb90b2adffdb81c9' 
  AND token = 'WJbuYUaKPAGjFTV5ZM+Is5D2cPuLT7q2LKmLQ7yH4RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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