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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6979265b1d9d8e4e817ed865b4ffe9d9a5214704ed9fdfe8b4a4ab44dd4c8c7b' 
  AND token = 'adLD4774q53VkssWZDWcmgAXr7jvfOfZgy/dwucfsiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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