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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1136dd93e926f2b29ac7965552fbe9211e36bb34a9acda355723b8ae7927d232' 
  AND token = 'h8qErkwObs/BG1HAD06MkL5IFOPt4eVzkuSxp0RLLdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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