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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33b71b8077126ab8bd3ea2b02a30c0fc5595d6219703444687d4f4816517e013' 
  AND token = 'bqr4lEfFEoFDKA/LMn0upaBuhmyJ57i094avVGKROaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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