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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb40179f7f8d738895d323778207c5df7849438451f5be3e44959ecffde817c0' 
  AND token = 'AflAp0MB7UU31lIQyF7CAuIfogJpsQWsiIxCvXw3rrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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