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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20cd6dc9b7317bff1140b3dcee438dc6569d506b8d4ec7e514a3ad59f4d73658' 
  AND token = 'SX4/WHukTPPo3Ew3hztw2vV68yQroN3VWa7eBewV8do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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