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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a0cde93bf71b5059e9e787c465dcc5a631508d7a89860bbfead553183f9328e' 
  AND token = 'iS+hXezg2qASQJufFbRx3/PL9dK++nmLLHH0pNQNN0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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