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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1db0c3771e4492c48917812e23d19b68aaa6afd048b35e256da6b9cb488e568' 
  AND token = '03Lnn175MNYwazfNBB19rpykutFI5PEsds9WgpoKkbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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