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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0604d4dd0990d9e4a17afd7059a298d35f5e66455a57a59ac9ef618fce9ee2bf' 
  AND token = 'Z8sriIT/lXKHOnsQTM7qi5i0+Cphh/0kvq7FEV9BSlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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