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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e50d28731e5ec2d6d8fa4ad106956ed2c4cdf3342f42183941f77a0b176699eb' 
  AND token = 'A93181q2pv8DkP7qx2YiXkPMLdBNRWJZMRmTpl2OmXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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