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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '208dbf034dc8ae94fa954868435dfab9567ff2d25cb04bf46f0760531cb3d97c' 
  AND token = 'KhWpE8rvtFfXdc1BpDxCePBY0VMxPilSDfAsztC2gc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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