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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd3e5931957512d18a3b225cb4296e092a73e01d90ca9a5bf2807186ec137e66' 
  AND token = 'qGQBR4t2XMrjK1C73of/l8yoESoB3nXC9gtHVF6YhQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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