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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b605e0b56f224b3a92ad2c0d3e32b3011fea5e0f0ebf53045b22dc3dc3eb71b0' 
  AND token = 'SOgdMiw/3SfZYeTnzD1Zw+4/aQwomLkGQvQ+EyMd/Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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