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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00f4df6ba55a3eb5978334da2971702d9ab35e27c923ded0f92a8ceacbca54a5' 
  AND token = 'tci//lQV6vlNQJumIc5dWhh8rrx8XEaRaF6/Xgp2ofA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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